Improvement in sewing-machines



UNITED STATES PATENT OrFIoE.

JOHN v. D. ELDREDGE, or DETROIT, MICHIGAN.

IMPROVEMENT m SEWING-MACHINES.

Specification forming part of Letters Patent No. 136,823, dated March18, 1873.

To all whom it may concern:

Be it known that I, JOHN V. D. ELDREDGE,

of Detroit, in the county of Wayne and State of Michigan, have inventeda new and useful Improvement in Sewing-Machines; and I do declare thatthe following is atrue and accurate description thereof, reference beinghad to the accompanying drawing and tothe letters of reference markedthereon and being a part, of this specification.

This invention relates to the feeding mechanism of a sewing-machine andconsists, mainly, in the combination of a spring-latch with afeed-actuating bar of peculiar construction, as will be fully describedhereinafter.

In the drawing, Figure 1 represents a perspective view of the lower sideof a sewing machine having my improvement ap-' Fig. 2 represents a sideele-* plied thereto. vation of a portion of the feed-actuating bar. Fig.3 is a sectional elevation of the feed-piece. Fig. 4 is a plan view ofthe needle-plate; and Fig. 5 is a perspective view of the upper end ofthe feed-piece.

in Figs. 1 and 3, to cause one part to pro-.

ject beyondthe line of the other, and being also provided upon one sidewith a peculiarlyshaped cam, c, which has its edge formed in a curvedline, as shown in Fig. 1, and is also constructed of wedge-like form,itsupper and lower face lines converging to a point at the one end, asshown inFig. It represents the feedpiece, provided at one end with atransverse slot, in'which moves the feedactuating bar P 5 and at theother with a slot, (1, inwhich rests a pivotpin, f, upon which thefeed-piece-vibrates in its upward and downward movements.

This feed-piece moves longitudinally in the guide-box e, by means ofwhich it is held from displacement; and is further provided with alatch, k, upon which rests the free end of the spring Z; and also withthe usual denticulated portion 9, which extends upward through anopening in the plate, as shown of the feed-piece B, and, consequently,ele-v vates the front end of the latter. The first part of the forwardmovement of the feedactuating bar then causes the flat end of its cam toengage with the end of the latch is attached to the feed-piece, by whichmeans the latter is carried forward against the force of the spring S.The latter part of the movement of the feed actuating bar causes itslower portion to come in contact with the lower surface of the slot, bywhich means the front end of the feed-piece is drawn downward; and atthis time, also, the cam 0 having passed the latch k, the feed-piece isleft free to move backward through the action of the spring S.

For the purpose of preventing the feedactuating bar from actuating thelatch k in its forward movement, and thus causing the feed to moveforward at the wrong time, the cam c is made of wedgeshape, so that itspoint passes behind the latch and elevates it, as shown in Fig.4,without affecting the longitudinal position of the feed iece.

p The described construction gives the desired movement of the feed inharmony with the other'movements of the machine.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination of the feed-piece R having the spring-latch k, withthe feed-aotuaiing bar 1?, substantially in the manner deating bar Phaving the wedge-shaped 0am c, scribed.

as described. J OHN- V. D. ELDREDGE. 2. The slotted feed-piece, providedwith the denticulated part g, latch is, and spring W'itnesses:

1, working in guides e, vibrating therein on H. F. EBERTS,

the pin f, and reciprocated by the feed-actu- MYRON H. CHURCH.

